Kolva (Usa)

The Kolva (Колва) is a river in Nenets Autonomous Okrug and the Komi Republic in Russia. It is a right tributary of the Usa of the Pechora basin. The length of the river is 564 km. The area of its basin 18,100 km2. The Kolva freezes up in late November and stays under the ice until mid-May.